Cartridge fuse holder



Oct. 16, 1956 J. J. JUNG 2,767,283

CARTRIDGE FUSE HOLDER Filed July 5, 1955 15 2 INVENTOR.

Z (/Ol/N J z/l/Ne United States Patent CARTRIDGE FUSE HOLDER John J. Jung, Chicago, Ill., assignor to General Patent Corporation, Chicago, Ill., a corporation of Illinois Application July 5, 1955, Serial No. 519,848

Claims. (Cl. 200-133) This invention relates to certain new and useful improvements in a cartridge fuse holder.

The invention contemplates a fuse holder of the character hereinafter described in which the holder will impose upon the fuse a uniform pressure, thereby to assure proper contact between the clamps of the holder and the fuse; a fuse holder in which the clamps cannot be distorted or misshaped by the placing or removing of the fuse within and from the holder; a fuse holder which will have the maximum holding power upon the fuse; and one in which the fuse cannot be accidentally displaced endwise but must be placed within or removed from the holder by lateral movement with respect to its length.

A still further object of the invention is the provision of a fuse holder which comprises relatively few parts, one which can be manufactured at an economical cost and one which will be highly eflicient in use.

Other objects will appear hereinafter.

The invention consists in the novel combination and arrangement of parts to be hereinafter described and claimed.

The invention will be best understood by reference to the accompanying drawings showing the preferred form of construction, and in which:

Fig. l is an elevational view of a fuse holder embodying my invention and arranged in gang formation;

Fig. 2 is a side view of the same;

Fig. 3 is an elevational view of the reverse side of the holder as shown in Fig. 1;

Fig. 4 is a fragmentary detail view taken susbtantially on line 4-4 of Fig. 1;

Fig. 5 is a fragmentary sectional detail view taken substantially on line 5-5 of Fig. 1;

Fig. 6 is a perspective view of parts of the clamp embodied in my invention showing the same in exploded relation;

Fig. 7 is a plan view of a blank from which the fuse clamp embodied in my invention is made.

It is an object of this invention, as before stated, to provide a fuse holder which will firmly hold a cartridge fuse while exerting a uniform pressure thereon. To accomplish this and other objects of the invention, my improved fuse holder includes a mounting plate 10 formed of non-conductive material, such as Bakelite or the like. On this plate may be mounted one or more fuse holders 11.

Each fuse holder 11 comprises a pair of clamps 12. These clamps 12 are arranged in spaced opposed relation with respect to each other. The clamps 12 are of like construction. Each is formed from a single blank 13 of conductive material. The blank is bent upon itself to provide a medial portion bifurcated as at 14 to provide a pair of spaced parallelly extending clamping fingers 26.

At the bight portion of the medial portion 15' there is formed an entrance opening 16 which communicates with an opening 15 of a diameter slightly less than the outside diameter of the cap 17 of a cartridge fuse 18. This opening 15 is located, as shown in Fig. 6, beneath the upper limb portions 14' of the medial portion.

The blank 13 has its opposite end portions bent in opposite directions and substantially at right angles with respect to the medial portion 15 to provide a terminal attaching plate 20 and a hook plate 27. The terminal plate 20 has an opening 21 to which the end of a wire to be soldered thereto may be projected. This terminal plate 20 provides a second opening 22 through which a rivet 23 or the like projects for connecting the clamp 12 to the mounting plate 10.

The mounting plate 10 is provided with an elongated slot 24. Beneath this slot 24 in the rear surface of the plate 10 is formed a shallow recess 25. The hook plate 27 is adapted to fit into this recess 25 with its outer surface substantially flush with the back surface of the plate 10. This is accomplished by projecting the lower portion of the medial portion of the blank 13 through the slot 24.

The metal from which the clamp is made is preferably of spring material whereby when the cap of the fuse 18 is positioned in the opening 15 it Will be yieldably held therein. By forming the clamp of yieldable material, the hook plate 27 is yieldably held in the shallow recess 25.

When the fuse is mounted between a pair of clamps 12 in the manner shown in Fig. 2, and as herein described, it will be noted that the cap 17 of the fuse will be located between the outer limb portions 14' of the medial portion of the blank 13. By this arrangement the cartridge fuse cannot be accidentally moved endwise so as to become disengaged by the clamps 12. By such arrangement the cartridge fuse can only be removed by a pulling force exerted in a direction laterally from the longitudinal axis of the cartridge.

As the diameter of the opening 15 is slightly smaller than the diameter of the fuse cap, the insertion of the cap 17 through the entrance opening 16 into the opening 15 will spread the clamping fingers 26 so as to effect a frictional engagement between the cap of the fuse and the clamping fingers 26, thereby to assure positive contact pressure between the fingers 26 and the fuse caps.

It is desirable that this pressure between the clamping fingers 26 and the fuse caps be such that while assuring positive contact pressure between the fingers 26 and the fuse caps, the pressure will not interfere with the ready removal of the fuse from the holder.

It will be apparent that my improved fuse holder is relatively simple and may be economically manufactured.

While I have illustrated and described the preferred form of construction for carrying my invention into effect, this is capable of variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to protect by Letters Patent is:

1. A cartridge fuse holder comprising a non-conductive mounting plate, a pair of clamps each formed of a single blank of conductive material bent upon itself to provide a medial horizontally extending portion bifurcated in the direction of its length to provide a pair of spaced clamping fingers for the reception of the cap of a cartridge fuse, said blank having its opposite end portions bent reversely to provide an attaching plate and an attaching hook, the attaching plate being connected to the mounting plate and serving as a terminal to which a conductor wire is to be attached, and the hook having hooked engagement with said mounting plate.

2. A cartridge fuse holder comprising a non-conductive mounting plate, a pair of clamps each formed of a single blank of conductive material bent upon itself to provide a medial horizontally extending portion bifurcated in the -direction of its length to provide a pair of spaced clamping fingers for the reception of the cap of a cartridge fuse,

said blank having its opposite .end ;por-tions bent reversely 'toprovide an attaching plate ,andangattaching hook, the attaching ,plateheingconnected .to the ,mounting plate .and servingasa terminal to which aeconductor wire is -to be attached, and the hook havinghookedengagement with said mounting plate, said mounting plate-having an elongated slot formed therein, saidhookprojected through said slot with said hook yieldably bearingagainst the back of said mounting plate.

,3. A cartridge fuse holder comprising anon-conductive mounting plate, a pair of clamps each formedof a single blank of conductive .material bent upon itself toprovide am flial horizontallyextendin-g portion-bifurcated inthe .directionofits length .to provide a pair of spaced clamping fingers for the reception of the cap of a cartridge fuse, said. blank having its opposite-end portionsbent reversely to-provide an attaching plate andan attaching hook, the attaching plate being connected to the mounting plate and serving as a terminal to which a conductor wire is .to be attached, and .the hook having hooked engagement with said mounting plate, said blank atits line .of bend providing an entrance slot for said cap communicating with the bifurcation of said medial portion.

4. A cartridge fuse holder comprising a.non-conductive mounting plate, a pair of clamps each formed of a single blank of conductive material bent upon itself to provide a medial horizontally extending portion bifurcated in the direction of its length to provide a pair of spaced clamping fingers for the reception of the cap of a cartridge fuse, said blank having its opposite end portions bent reversely to provide an attaching plate and an attaching hook, the attaching plate being connected to the mounting plate and serving as a terminal to which a conductor wire is to be attached, and the hook having hooked engagement with said mounting plate, said mounting plate having an elongated slot formed therein, said hook projected through said slot with said hook yieldably bearing against the back of said mounting plate, said blank at its line of bend providing an entrance slot for said cap communicating with the bifurcation of said medial portion.

5. A cartridge fuse holder'comprising a non-conductive mounting plate, a pair of clamps each formed of a single blank of conductive material bent upon itself toprovide a medial horizontally extending portion bifurcated in the direction of its length to provide a pair of spaced clamping fingers for the reception'of the cap of a cartridge fuse, said blank having its opposite end portions bent reversely to provide an attaching plate and an attaching hook, the attaching plate being connected to the mounting plate and serving as a terminal to which a conductor wire is to be attached, and the hook having hooked engagement with said mounting plate, said blank at its line of bendproviding an entrance slot for said cap communicating with the bifurcation of said medial portion, the cap of said fuse when positioned in said entrance slot being disposed beneath the upper portion of said bifurcated portion.

References Cited in the file of this patent UNITED STATES PATENTS 802,736 Cook Oct. 24, 1905 1,611,183 Frasse Dec. 21, 1926 2,011,391 Bennett Aug, 13, 1935 2,264,260 Schmitt'etal Nov. 25, 1941 FOREIGN PATENTS 448,509 Great Britain June8, 1936 683,968 Germany Nov. 20, 1939 

